Reads data from local database

Reads data from local database

Usage

cas_read_from_db(
  table,
  db_folder = NULL,
  db_connection = NULL,
  disconnect_db = FALSE,
  ...
)

Arguments

table

Name of the table. See readme for details.

db_connection

Defaults to NULL. If NULL, uses local SQLite database. If given, must be a connection object or a list with relevant connection settings (see example).

disconnect_db

Defaults to TRUE. If FALSE, leaves the connection to database open.

...

Passed to cas_get_db_file().

See also

Other database functions: cas_check_db_folder(), cas_check_use_db(), cas_connect_to_db(), cas_create_db_folder(), cas_disable_db(), cas_disconnect_from_db(), cas_enable_db(), cas_get_db_settings(), cas_set_db_folder(), cas_set_db(), cas_write_to_db()

Examples

cas_set_options(
  base_folder = fs::path(tempdir(), "R", "castarter_data"),
  project = "example_project",
  website = "example_website"
)
cas_enable_db()


urls_df <- cas_build_urls(
  url = "https://www.example.com/news/",
  start_page = 1,
  end_page = 10
)

cas_write_to_db(
  df = urls_df,
  table = "index_id"
)

cas_read_from_db(table = "index_id")
#> # Source:   table<index_id> [?? x 3]
#> # Database: sqlite 3.44.2 [/tmp/RtmpKZFKM9/R/castarter_data/cas_example_project_example_website_db.sqlite]
#>       id url                             index_group
#>    <dbl> <chr>                           <chr>      
#>  1     1 https://www.example.com/news/1  index      
#>  2     2 https://www.example.com/news/2  index      
#>  3     3 https://www.example.com/news/3  index      
#>  4     4 https://www.example.com/news/4  index      
#>  5     5 https://www.example.com/news/5  index      
#>  6     6 https://www.example.com/news/6  index      
#>  7     7 https://www.example.com/news/7  index      
#>  8     8 https://www.example.com/news/8  index      
#>  9     9 https://www.example.com/news/9  index      
#> 10    10 https://www.example.com/news/10 index      
#> # ℹ more rows